@media (max-width: 900px) {
  .product-detail-page {
    --product-detail-mobile-bar-height: 48px;
    --product-detail-sticky-top: var(--mobile-header-height-authenticated);
  }

  body:has(.nav[data-auth-state="anonymous"]) .product-detail-page {
    --product-detail-sticky-top: var(--mobile-header-height);
  }

  .product-top-section {
    padding-bottom: 18px;
  }

  .product-detail-page.is-product-detail-enhanced .product-purchase-slot--top {
    display: none;
  }

  .product-detail-page:not(.product-detail-page--mobile-purchase) .product-purchase-slot--top {
    display: none;
  }

  body.has-product-mobile-purchase .footer {
    padding-bottom: calc(42px + var(--product-detail-mobile-bar-height, 48px) + env(safe-area-inset-bottom));
  }

  .product-detail-page.is-product-detail-enhanced .product-detail-mobile-purchase {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 45;
    display: grid;
    min-height: calc(var(--product-detail-mobile-bar-height) + env(safe-area-inset-bottom));
    grid-template-columns: 36px minmax(0, 1fr);
    align-items: center;
    gap: 8px;
    padding: 6px max(10px, env(safe-area-inset-right)) calc(6px + env(safe-area-inset-bottom)) max(10px, env(safe-area-inset-left));
    border-top: 1px solid var(--line-strong);
    background: rgba(255, 255, 255, 0.98);
  }

  .product-detail-mobile-purchase form {
    display: grid;
    margin: 0;
  }

  .product-mobile-wishlist-action,
  .product-mobile-checkout-action {
    min-height: 36px;
    border-radius: var(--radius-sm);
  }

  .product-mobile-wishlist-action {
    display: grid;
    width: 36px;
    padding: 0;
    place-items: center;
    border: 1px solid var(--brand);
    background: var(--surface);
    color: var(--brand-dark);
    cursor: pointer;
  }

  .product-mobile-wishlist-action .product-action-icon {
    width: 16px;
    height: 16px;
    flex-basis: 16px;
  }

  .product-mobile-checkout-action,
  .product-mobile-checkout-action:hover {
    width: 100%;
    border-color: var(--brand-dark);
    background: var(--brand-dark);
    color: var(--text-inverse);
    font-size: var(--fs-sm);
    font-weight: 400;
  }

  .detail-tabs-direct-menu {
    top: var(--product-detail-sticky-top);
    transition: top 200ms ease;
  }

  #product-order,
  .product-detail-copy {
    scroll-margin-top: calc(var(--product-detail-sticky-top) + 64px);
  }

  .detail-tabs-direct-menu,
  .product-detail-description-shell,
  #detail-reviews,
  #detail-qna {
    width: 100vw;
    margin-inline: calc(50% - 50vw);
  }

  .product-detail-page.is-product-detail-enhanced .product-info-lines,
  .product-detail-page:not(.product-detail-page--mobile-purchase) .product-info-lines {
    margin-bottom: 0;
  }

  #detail-description,
  .detail-scroll-images,
  .detail-scroll-images img {
    width: 100%;
    max-width: none;
  }

  .detail-scroll-images img {
    height: auto;
  }
}

@media (max-width: 640px) {
  .product-purchase-panel .product-price-line {
    flex-wrap: wrap;
    column-gap: 12px;
    row-gap: 4px;
    white-space: normal;
  }

  .product-purchase-panel .product-price-pair {
    flex: 0 0 auto;
    white-space: nowrap;
  }

  .product-purchase-panel .product-price-divider {
    display: none;
  }

  .product-purchase-summary-row {
    flex: 1 1 0;
    width: auto;
  }

  .product-purchase-controls {
    gap: 8px;
  }

  .quantity-control {
    flex: 0 0 96px;
    width: 96px;
    grid-template-columns: 24px minmax(40px, 1fr) 24px;
    gap: 4px;
  }

  .product-payment-total {
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 2px;
  }

  .product-action-grid {
    flex: 0 0 124px;
    gap: 4px;
    width: 124px;
  }

  .product-action-button,
  .product-action-button:hover {
    min-height: 30px;
    padding: 0 2px;
    gap: 3px;
    font-size: 0.6875rem;
    font-weight: 400;
  }

  .product-action-icon {
    width: 12px;
    height: 12px;
    flex-basis: 12px;
  }

  .detail-tabs-direct-menu {
    position: sticky;
    top: var(--product-detail-sticky-top);
    z-index: 5;
    margin-bottom: 0;
    padding: 0;
    border: 1px solid var(--line);
    border-radius: 0;
    background: rgba(255, 255, 255, 0.96);
    box-shadow: none;
  }

  .detail-tabs-shell .detail-tabs {
    position: static;
    gap: 14px;
    margin: 0;
    padding: 2px 10px;
    border: 0;
    border-radius: 0;
    background: transparent;
  }

  .detail-tabs-shell .detail-tabs a {
    min-height: 30px;
    padding: 2px 0;
    border-radius: 0;
    font-size: var(--fs-sm);
    font-weight: 400;
  }

  #product-order,
  .product-detail-copy {
    scroll-margin-top: calc(var(--product-detail-sticky-top) + 64px);
  }
}

@media (max-width: 900px) and (prefers-reduced-motion: reduce) {
  .detail-tabs-direct-menu {
    transition: none;
  }
}